function createCookie(name,value,days) {
	if (days) {
		var date = new Date();
		date.setTime(date.getTime()+(days*24*60*60*1000));
		var expires = "; expires="+date.toGMTString();
	}
	else var expires = "";
	document.cookie = name+"="+value+expires+"; path=/";
}

function readCookie(name) {
	var nameEQ = name + "=";
	var ca = document.cookie.split(';');
	for(var i=0;i < ca.length;i++) {
		var c = ca[i];
		while (c.charAt(0)==' ') c = c.substring(1,c.length);
		if (c.indexOf(nameEQ) == 0) return c.substring(nameEQ.length,c.length);
	}
	return null;
}

function eraseCookie(name) {
	createCookie(name,"",-1);
}




var _citySelect = function() {
	this.cities = new Array();
	this.tzs = new Array();
	this.onSet;
    this.onChange;
	
	this.set_city = function(city_id, city_name) {
		eraseCookie('city_id');
		createCookie('city_id', city_id, 0);
		this.set_city_on_page();
        if (this.onChange != null) {
            this.onChange(city_id);
        }
	}
	
	this.set_city_on_page = function() {
		city_id = readCookie('city_id');
		
		if (city_id == null)
		{
			city_id = 9;
		}
		
		$('cname').innerHTML = this.cities[city_id];
		
		window.user['city_id'] = city_id;
		window.user['city_name'] = this.cities[city_id];
		
        Clock.offset = this.tzs[city_id];
		if (this.onSet != null) {
			this.onSet(city_id);
		}

		
		
	}
	
	return this;
}

var CitySelect = new _citySelect();